Documenting Typing the Extended PrismaClient

I've been running into an issue where the VSCode Typescript errors with errors like the following:
```
Excessive stack depth comparing types...
```
```
This expression is not callable....
```
After searching and consulting with various AI oracles I realized the issue could be solved by removing the prisma-field-encryption extension. This Github issue was a hint, although the discussion is from when clientExtensions were a preview feature.

https://github.com/prisma/prisma/issues/17236

The solution seems to be the following:

```typescript
import { PrismaClient } from '@prisma/client'
import { fieldEncryptionExtension } from 'prisma-field-encryption'
import { type PrismaClientExtends } from '@prisma/client/extension'
import type * as runtime from '@prisma/client/runtime/library'

// Define the extended client type using Prisma's extension type system
type ExtendedClient = PrismaClient & PrismaClientExtends

const globalClient = new PrismaClient()

export const client = globalClient.$extends(
// This is a function, don't forget to call it:
fieldEncryptionExtension()
) as ExtendedClient

export type { ExtendedClient as PrismaClient }
```

Does this fix make sense? It is working nicely for me. If so I'd like to open a PR to add this to the Readme. 🙏